6SN7W / 6SN7GT Sylvania Nickel Base, blackplate clearglass, heavy top getter flashing.
Bought this past November from
Brent Jessee Recording & Supply, Inc. Seldom used since I was without the pre-amp I bought it for for several months.
Description from the website:
New Old Stock white box. This is the the very rare 1940s Sylvania first production of the 6SN7 tube, with the nickel collar base. Black triangular plates facing each other, original type tall boy envelope, heavy chrome dome getter flashing. Said to be the Sylvania answer to the Tung Sol oval plate, and they sound incredible. Extremely rare.
Free US & Canada shipping.
Will ship worldwide, but contact me for a quote as shipping some places can be extremely expensive.